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Effects of Cadmium Treatment on Carbohydrate Allocation and Partitioning of Five Half-sib Families of Betula schmidtii  

Han, Sim-Hee (Department of Forest Genetic Resources, Korea Forest Research Institute)
Oh, Chang-Young (Department of Forest Genetic Resources, Korea Forest Research Institute)
Lee, Jae-Cheon (Department of Forest Genetic Resources, Korea Forest Research Institute)
Kim, Pan-Gi (Department of Forest Resources and Environment, Sangju National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.8, no.1, 2006 , pp. 15-21 More about this Journal
Abstract
This study was conducted to understand the regulation mechanism of carbohydrate allocation and partitioning of one-year-old seedlings of Betula schmidtii with Cd treatment, and to assess tolerance against Cd toxicity among five half-sib families on the basis of carbon allocation and partitioning. Seedlings were treated with $CdSO_4$ solution of 0, 0.2, 0.4, and 0.6 mM for two months. After harvesting, carbohydrate concentrations were analyzed for leaves, stems and roots of seedlings. Carbohydrate concentration for Cd-treated seedlings decreased in comparison with control plants, even though Cd effects were significantly different among five families. Meanwhile, Cd treatment decreased carbohydrate allocation in leaves and increased allocation in roots. In addition, partitioning of glucose in leaves was increased by Cd treatment, but partitioning of sucrose and starch in leaves decreased. In Cd-treated roots, partitioning of glucose, sucrose and starch increased. On the basis of carbohydrate allocation patterns, 'Family No. 7' (of the five families studied) was considered as the most sensitive family to Cd toxicity because the decrease of carbohydrate concentration and the change of carbohydrate allocation pattern after Cd treatment were relatively greater.
Keywords
Cd toxicity; Tolerance; Glucose; Sucrose; Starch;
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